Sconce



FIG. 1 is a left side elevational view of a sconce showing our new design (right side elevational view is a mirror image thereof);

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left, front perspective view thereof; and,

FIG. 4 is a left, rear perspective view thereof.

The broken lines are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a sconce, as shown and described. 